3 1/3 cups milk
4 tablespoons butter
3 tablespoons flour
salt to taste
Heat milk in medium saucepan to just below boiling and keep warm.
Melt butter in a small saucepan and whisk or stir in a small amount of flour at a time. Cook and stir constantly for 4 minutes.
Bring milk to a boil and add butter mixture, stirring constantly. Add salt to taste.